The parameterized mathematical model of double - hinged system has been established . the kinematics and dynamics analysis to the propulsion processe have been established 建立了参数化的两关节尾鳍推进模式的数学模型,并对推进过程进行了运动学和动力学分析。
First , we calculate the hydrodynamic performance of the caudal fin which is considered as a rigid body using surface panel method . then a detailed analysis is given 首先把尾鳍视为刚性体，采用面元法计算其水动力性能，详细分析其水动力系数随尾鳍运动参数的变化规律。
And explain the correlative parameters and the mechanics of the caudal fin locomotion . the equation of the robotic fish caudal fin locomotion is deduced in the third section 在第三部分，本文分析了鱼类尾鳍推力方程，说明了提高尾鳍摆动的振幅和频率可以提高尾鳍的前向推力。
Chosen from the title of " the 300 , 000t twin - skeg type vlcc with super breath and shallow draught " , the subtitle of general arrangement and structural optimization are studied in this paper 本文结合“超宽浅吃水双尾鳍30万吨超大型油船”课题，选择其中两个关键技术(即总体和结构优化)进行研究。
The quest for the perfect halfmoon by selectively breeding for branching and straight caudal edges has given rise to a new development in the betta splendens tailforms - the rosetail 为追求最完美的半月斗鱼，经由淘汰育种，培育巨大或直挺的尾鳍，斗鱼尾鳍样式已经演化出一新的支系，著名的玫瑰尾斗鱼。
We are particularly awed by two of the orcas ' showstopper stunts when they spy hop ( lift their heads out of water to look ) and lob tail ( hit the surface with the underside of the fluke ) 这些虎鲸的两项精彩绝技尤其令人震撼，也就是?们的浮窥（把头抬出水面张望）和挑尾（用尾鳍底部拍打水面） 。
The second section describes the morphological features and the swimming mechanisms of fish and explains the reason why this paper chooses bcf propulsive fishes as the model 在第二部分里描述了鱼类游动机理和行为特征，并对本文为何选择bcf推进式鱼类作为仿生对象作了解释，并说明了尾鳍运动学参数和受力情况。
The action is mostly underwater where the whales " herd " the herring into a tight ball , then slap the fish with their tail flukes , literally sending the fish flying as they stun or kill the herring 这个动作大多在水中进行，鲸鱼把鲱鱼群驱赶成一个饱满的球形，再用尾鳍用力拍打鱼群，鲱鱼就在打晕或击毙的同时飞散出去。
This dissertation sets up the kinematics model on the basis of the biomimetic study of lunate - tail propulsion steady swimming fish and of the analysis of fish body motion and caudal fin motion 本文在综合国内外鱼类游动文献中的有关研究成果的基础上，分析了鱼类游动过程中鱼体和尾鳍运动，建立了月牙尾推进模式稳态游动的运动学模型。
It is the first try for us to study the 300 , 000t twin - skeg type vlcc with super breath and shallow draught , which can lead us to hold the design and building technology of the new generation vlcc 因此，对于我们来说，对超宽浅吃水双尾鳍超大型油船的开发研究，是一次全新的尝试。通过这个项目，我们期待尽快掌握新一代vlcc的设计建造技术，才能抓住机遇，在vlcc市场竞争中立于不败之地。
